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FANUC Alarm HOST-166 — WARN EXMG: Write Pending

FANUC HOST-166 (“WARN EXMG: Write Pending”): Attempt to read before write. First check: A write should precede read.

Updated 2026-08-29 · LogrobotLM reference

Description

Attempt to read before write.

Remedy · Remède

A write should precede read.

Frequently asked · Questions fréquentes

What does FANUC alarm HOST-166 mean?
FANUC HOST-166 (“WARN EXMG: Write Pending”): Attempt to read before write.
How do you troubleshoot FANUC alarm HOST-166?
A write should precede read.

Related codes / Codes liés

HOST-164WARN EXMG: Read PendingHOST-165WARN EXMG: Internal ErrorHOST-167WARN EXMG: Connection ErrorHOST-168WARN EXMG: Invalid Channel

Indicative field information — the robot manufacturer's manual and safety procedures always prevail. Never bypass a safety device; apply lockout/tagout (LOTO) before any physical intervention. · Informations indicatives issues du terrain — le manuel du constructeur et ses procédures de sécurité font foi. Ne shuntez jamais un organe de sécurité ; consignez (LOTO) avant toute intervention physique. How this reference is built →